The invention discloses a key ring. According to the technical scheme, the key ring comprises a key ring main body which is arranged to be in a hook shape and composed of an upper key ring portion and a lower key ring portion; the upper key ring portion is slidably matched with an opening and closing rod at a hook-shaped opening, a cavity is formed in the opening and closing rod, a rectangular guide groove communicated with the cavity is formed in the outer wall of the opening and closing rod in the length direction of the opening and closing rod, a plurality of limit holes are formed in the two sides of the guide groove at intervals in the arrangement direction of the guide groove and are all communicated with the guide groove, an annular elastic ring is arranged in the cavity in the arrangement direction of the guide groove, the elastic ring extends towards the two sides to form limit blocks matched with the limit holes and extends outwards on the guide groove side to form a button portion, and a through hole for allowing the button portion to penetrate is formed in the upper key ring portion. The key ring is higher in safety coefficient in the ordinary wearing process and can prevent keys from falling off.